Github user mattyb149 commented on a diff in the pull request:

    https://github.com/apache/nifi/pull/255#discussion_r67277159
  
    --- Diff: 
nifi-nar-bundles/nifi-elasticsearch-bundle/nifi-elasticsearch-processors/src/main/java/org/apache/nifi/processors/elasticsearch/PutElasticsearch.java
 ---
    @@ -178,8 +190,20 @@ public void onTrigger(final ProcessContext context, 
final ProcessSession session
                             public void process(final InputStream in) throws 
IOException {
                                 String json = IOUtils.toString(in, charset)
                                         .replace("\r\n", " ").replace('\n', ' 
').replace('\r', ' ');
    -                            bulk.add(esClient.get().prepareIndex(index, 
docType, id)
    -                                    .setSource(json.getBytes(charset)));
    +
    +                            if (indexOp.equalsIgnoreCase("index")) {
    +                                
bulk.add(esClient.get().prepareIndex(index, docType, id)
    +                                        
.setSource(json.getBytes(charset)));
    +                            } else if (indexOp.equalsIgnoreCase("upsert")) 
{
    --- End diff --
    
    I haven;t seen a difference in behavior between index and upsert, I tried 
setting the document identifier attribute to a constant number. What should I 
do to try upsert or update?


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